TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Garcia Martin, L. M.
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
AU  - Sanchez Mayordomo, C.
PY  - 2020
DA  - 2020//
TI  - Strong constraints on the b -> s gamma photon polarisation from B-0 -> K(*0)e(+)e(-) decays
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 081
EP  - 25pp
VL  - 12
IS  - 12
PB  - Springer
KW  - Rare decay
KW  - Flavour Changing Neutral Currents
KW  - Polarization
KW  - B physics
KW  - Hadron-Hadron scattering (experiments)
AB  - An angular analysis of the B-0 -> K*(0)e(+)e(-) decay is performed using a data sample corresponding to an integrated luminosity of 9 fb(-1) of pp collisions collected with the LHCb experiment. The analysis is conducted in the very low dielectron mass squared (q(2)) interval between 0.0008 and 0.257 GeV2, where the rate is dominated by the B-0 -> K*(0)gamma transition with a virtual photon. The fraction of longitudinal polarisation of the K*(0) meson, F-L, is measured to be F-L = (4.4 +/- 2.6 +/- 1.4)%, where the first uncertainty is statistical and the second systematic. The A(T)(Re) observable, which is related to the lepton forward-backward asymmetry, is measured to be A(T)(Re) = -0.06 +/- 0.08 +/- 0.02. The A(T)((2)) and A(T)(Im) transverse asymmetries, which are sensitive to the virtual photon polarisation, are found to be A(T)((2)) = 0.11 +/- 0.10 +/- 0.02 and A(T)(Im) = 0.02 +/- 0.10 +/- 0.01. The results are consistent with Standard Model predictions and provide the world's best constraint on the b -> s gamma photon polarisation.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2010.06011
UR  - https://doi.org/10.1007/JHEP12(2020)081
DO  - 10.1007/JHEP12(2020)081
LA  - English
N1  - WOS:000599160700001
ID  - LHCbCollaborationAaij_etal2020
ER  -